Animals animal model article nonhuman 598 animal experiment 558 controlled study 544 priority journal 440 mouse 418 Mice 416 animal tissue 322 Female 296 animal cell 296 female 282 Male 246 male 240 protein expression 182 Mice, Inbred BALB C 164 Rats 154 rat 150 Humans 130 unclassified drug 126 human 100 Animalia 98 animal 98 enzyme activity 94 cell proliferation 90 drug effect 90 in vivo study 88 Disease Models, Animal 84 in vitro study 80